Patents

Search tools Text Classification Chemistry Measure Numbers Full documents Title Abstract Claims All Any Exact Not Add AND condition These CPCs and their children These exact CPCs Add AND condition
Exact Exact Batch Similar Substructure Substructure (SMARTS) Full documents Claims only Add AND condition
Add AND condition
Application Numbers Publication Numbers Either Add AND condition

Classifications

H03F1/56 Modifications of input or output impedances, not otherwise provided for
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CS178161B2

Czechoslovakia


Worldwide applications
1973 US DE CA GB ES CS CH FR IT JP NL BR BE DD AR AT SE

Application CS8995A events
1973-12-27
Application filed